Tube - 29" x 2.10 (700 x 50-52c) 48mm PRESTA or 48mm SCHRADER Valve. Replacement tube for 29'r Mountain bike, cruiser or bicycle with same tire size. MTB MTN style bike 2 Schrader 48mm Valve Inner Tubes in their own box 29" x 2.10 (700 x 50-52c) ISO 622 48mm SCHRADER Valve Replacement inner tube for a mountain, cruiser or other bike with the same tire size.